:root {
  color-scheme: dark;
  --bg: #08111f;
  --panel: #101b2d;
  --panel-2: #14233a;
  --border: #253857;
  --text: #f4f7fb;
  --muted: #9eb0c9;
  --cyan: #32d5f2;
  --cyan-2: #19b7d3;
  --danger: #ff7979;
  --shadow: 0 22px 70px rgba(0, 0, 0, .28);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 18% 0%, rgba(50, 213, 242, .10), transparent 28rem),
    linear-gradient(180deg, #08111f 0%, #0b1524 100%);
  color: var(--text);
}

button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { opacity: .45; cursor: not-allowed; }

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  max-width: 1500px;
  margin: 0 auto;
  padding: 2.5rem 2rem 1.5rem;
}
.topbar h1 { margin: .2rem 0 .35rem; font-size: clamp(2rem, 4vw, 3.5rem); letter-spacing: -.045em; }
.topbar p { margin: 0; color: var(--muted); max-width: 720px; }
.eyebrow { color: var(--cyan); font-size: .78rem; font-weight: 800; letter-spacing: .17em; }
.privacy { margin-top: .5rem; padding: .55rem .8rem; border: 1px solid var(--border); border-radius: 999px; color: var(--muted); white-space: nowrap; }

.layout {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 2rem 2rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 1.2rem;
  align-items: start;
}
.panel {
  background: linear-gradient(180deg, rgba(20, 35, 58, .96), rgba(16, 27, 45, .96));
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.upload-panel { grid-column: 1 / -1; padding: 1.25rem; }
.upload-panel h2, .workspace h2, .controls h2 { margin: 0 0 1rem; font-size: 1.05rem; }
.upload-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem; margin-bottom: 1rem; }
.dropzone {
  display: grid;
  gap: .25rem;
  padding: 1.15rem;
  border: 1px dashed #3a5a82;
  border-radius: 15px;
  background: rgba(7, 17, 31, .4);
  transition: border-color .2s, transform .2s, background .2s;
}
.dropzone:hover { border-color: var(--cyan); background: rgba(50, 213, 242, .05); transform: translateY(-1px); }
.dropzone input { margin-top: .6rem; width: 100%; }
.drop-title { font-weight: 800; }
.drop-subtitle, .file-name, .muted, .status { color: var(--muted); }
.file-name { font-size: .85rem; overflow-wrap: anywhere; }

.primary, .secondary, .tab {
  border: 0;
  border-radius: 11px;
  padding: .76rem 1rem;
  font-weight: 800;
}
.primary { background: linear-gradient(135deg, var(--cyan), var(--cyan-2)); color: #04202a; }
.secondary { background: #192b45; color: var(--text); border: 1px solid #2b4569; }
.status { margin: .8rem 0 0; font-size: .92rem; }
.status.error { color: var(--danger); }

.workspace { padding: 1rem; min-width: 0; }
.workspace-header { display: flex; justify-content: space-between; gap: 1rem; align-items: flex-start; margin-bottom: .9rem; }
.tabs { display: flex; flex-wrap: wrap; gap: .4rem; justify-content: flex-end; }
.tab { padding: .55rem .72rem; background: #13243b; color: var(--muted); border: 1px solid transparent; }
.tab.active { color: #051820; background: var(--cyan); }

.viewer {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 560px;
  background:
    linear-gradient(45deg, #0d1727 25%, transparent 25%),
    linear-gradient(-45deg, #0d1727 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #0d1727 75%),
    linear-gradient(-45deg, transparent 75%, #0d1727 75%), #101c2e;
  background-size: 26px 26px;
  background-position: 0 0, 0 13px, 13px -13px, -13px 0px;
  border-radius: 15px;
  overflow: hidden;
  border: 1px solid #203551;
}
.viewer img { max-width: 100%; max-height: 74vh; object-fit: contain; display: block; }
.viewer .layer, .viewer .single { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
.viewer.blinking .layer { animation: blink 1.8s steps(1, end) infinite; }
@keyframes blink { 0%, 49.9% { opacity: 0; } 50%, 100% { opacity: 1; } }
.slider-handle { position: absolute; top: 0; bottom: 0; left: 50%; width: 3px; background: white; box-shadow: 0 0 0 1px rgba(0,0,0,.35); pointer-events: none; }
.slider-handle::after { content: "↔"; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); background: white; color: #07111f; border-radius: 999px; padding: .45rem; font-weight: 900; }
.legend { padding: .7rem .2rem .1rem; color: var(--muted); font-size: .88rem; }

.controls { padding: 1rem; position: sticky; top: 1rem; }
.control-row { margin-bottom: 1rem; }
.control-row label { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: .45rem; font-size: .9rem; color: var(--muted); }
.control-row output { color: var(--text); font-variant-numeric: tabular-nums; }
.control-row input { width: 100%; accent-color: var(--cyan); }
.button-row { display: grid; grid-template-columns: 1fr 1fr; gap: .6rem; }
.metrics { margin-top: 1rem; padding: .8rem; border-radius: 13px; background: rgba(7, 17, 31, .6); border: 1px solid #223957; font-size: .84rem; color: var(--muted); line-height: 1.55; }
.metrics strong { color: var(--text); }
.export-title { margin-top: 1.4rem !important; }
.export-grid { display: grid; gap: .55rem; }

footer { max-width: 1500px; margin: 0 auto; padding: 0 2rem 2rem; color: var(--muted); font-size: .83rem; }
footer > p { margin: 0; }
.support-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.coffee-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  padding: .68rem .95rem;
  border: 1px solid #2b4569;
  border-radius: 11px;
  background: #192b45;
  color: var(--text);
  font-size: .88rem;
  font-weight: 800;
  text-decoration: none;
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.coffee-button:hover {
  transform: translateY(-1px);
  border-color: var(--cyan);
  background: #1d3452;
}
.coffee-button:focus-visible {
  outline: 3px solid rgba(50, 213, 242, .35);
  outline-offset: 3px;
}
@media (max-width: 700px) {
  .support-block { align-items: flex-start; flex-direction: column; }
}
.hidden { display: none !important; }

@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .controls { position: static; }
  .workspace-header { display: block; }
  .tabs { justify-content: flex-start; margin-top: .7rem; }
}
@media (max-width: 680px) {
  .topbar { display: block; padding: 1.5rem 1rem 1rem; }
  .privacy { display: inline-block; margin-top: 1rem; }
  .layout { padding: 0 1rem 1rem; }
  .upload-grid { grid-template-columns: 1fr; }
  .viewer { min-height: 420px; }
}

.appearance-card {
  margin: 1.1rem 0;
  padding: .9rem;
  border: 1px solid #2b4569;
  border-radius: 14px;
  background: rgba(7, 17, 31, .55);
}
.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  cursor: pointer;
}
.toggle-row span { display: grid; gap: .2rem; }
.toggle-row strong { color: var(--text); }
.toggle-row small { color: var(--muted); line-height: 1.35; }
.toggle-row input {
  width: 1.2rem;
  height: 1.2rem;
  accent-color: var(--cyan);
  flex: 0 0 auto;
}
.control-row.compact { margin-top: .9rem; margin-bottom: .55rem; }
.control-row.disabled { opacity: .38; pointer-events: none; }
.appearance-note {
  margin: .45rem 0 0;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.45;
}